Dopamine D1 Receptor Gene

Dopamine D2 Receptor Gene

Dopamine D3 Receptor Gene

Dopamine D4 Receptor Gene

Dopamine Transporter Gene

Serotonin 2a Receptor Gene

Serotonin Transporter Gene

Mu-opiate Receptor Gene

GABA –B3Receptor Gene

PENK Gene

Mono-Amine –Oxidase A Gene

Catecholamine –Methyl-Transferase Gene

Cytochrome P450 Gene

Table 1: Proposed Genetic Addiction Risk Score (GARS).